ios - 无法将正确的数据从 UITableView 内嵌的 UICollectionView 发送到 ViewController Swift3

Question

我正在使用嵌入在 UITableView 中的 UICollectionView。当用户点击 UITableView 内的 UICollectionViewCell 时，我正在播放音乐，但是当 UITableView 第一次加载时，数据变量为 nil，当用户点击 UICollectionViewCell 时，传递了 nil 值。当用户再次点击 UICollectionViewCell 时，它会显示该 UICollectionViewCell 的实际值。

这是我的代码:

//UITableViewCell

import UIKit

class CategoryRow : UITableViewCell {

 @IBOutlet var collectionView: UICollectionView!

var vcInstance: newHomeTableViewController?
var parentViewController: UIViewController? = nil


 var didSelectAction: (() -> Void )?

 }

extension CategoryRow : UICollectionViewDataSource , UICollectionViewDelegate{

 func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {

    return imageurl.count
}


func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {

    let cell  = collectionView.dequeueReusableCell(withReuseIdentifier: "newHomeCell1", for: indexPath) as! CollectionViewCell

     cell.image1.sd_setImage(with: URL(string: imageurl[indexPath.row]))

    return cell

}


func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
    //print("cell no: \(indexPath.row) of collection view: \(collectionView.tag)")

    didSelectAction!()

     vcInstance?.musicName = RemoteModel.sharedInstanceRemoteModel.singleGuidedTrandingTrackname[indexPath.row]
     vcInstance?.musicUrl = RemoteModel.sharedInstanceRemoteModel.singleGuidedTrandingTrackurl[indexPath.row]

    }

   }

   extension CategoryRow : UICollectionViewDelegateFlowLayout {

 func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
    let _: CGFloat = 10
    return CGSize(width : (collectionView.bounds.width)/2 - 10, height : collectionView.bounds.height - 10)
   }

  }

//TableViewController:-

import UIKit

class newTableViewController: UITableViewController {

 var musicName : String?
 var musicUrl : String?

override func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat
{

    return 70
}

override func numberOfSections(in tableView: UITableView) -> Int {
    return 1
}

override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {

    return 1
}

override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {

         let cell : CategoryRow = tableView.dequeueReusableCell(withIdentifier: "cell")as! CategoryRow

        cell.vcInstance = self
         cell.parentViewController = self

         cell.didSelectAction = {
             self.performSegue(withIdentifier: "homePlayer", sender: indexPath)
         }

        return cell
    }

override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {

}

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
   if segue.identifier == "homePlayer" {

        let playerVC = segue.destination as! playerViewController

        playerVC.UrlAudio = musicUrl
        playerVC.songTittle = musicName

       }
    }

  }

除了第一次加载 UITableView 时，数据变量为 nil 外，这工作得很好。提前致谢。

Answer 1

请引用下面的代码，我已经为您创建了一个演示，符合您的要求，希望对您有所帮助!

class ViewController: UIViewController, UITableViewDelegate, UITableViewDataSource{


     @IBOutlet weak var tblView: UITableView!
     @IBOutlet weak var outputLbl: UILabel!

     var content = ["Good Morning1","Good Morning2","Good Morning3","Good Morning4","Good Morning5"]

     override func viewDidLoad() {
          super.viewDidLoad()
          tblView.rowHeight = 400
     }

     func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
     return 01
     }

     func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
          let cell = tableView.dequeueReusableCell(withIdentifier: "tableCell", for: indexPath ) as! aTableViewCell
          cell.aCollection.reloadData()
          return cell
     }
}

extension ViewController : UICollectionViewDelegate, UICollectionViewDataSource {
     func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
          return content.count
     }

     func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
         let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "collectionCell", for: indexPath) as! ACollectionViewCell
          cell.aLabel.text = content[indexPath.item]
          return cell
     }

     func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
          let collectionCell = collectionView.cellForItem(at: indexPath) as! ACollectionViewCell
          let selectedData = collectionCell.aLabel.text
          outputLbl.text = selectedData
     }

}

class aTableViewCell : UITableViewCell{

     @IBOutlet weak var aCollection: UICollectionView!
}